BLOK modular set to bang on random keys/throw random parameters in various places. Sort of a kind of FM synthesis but I'm pretty sure BLOK can do a lot of extra things like place filters/waveshapers after the modulator but before the main oscillator. Don't want to give away much else but you can improv random textures by drawing in a waveshaper window/right-click to drag the drawing from one side to another. Also you can use the atan button to scale the notes on some sort of curve by distorting the note values. I could've added delay/reverb/EQ/ ambience but I wanted it to be as dry as possible because that's personally what I look for, raw sounds that you can choose to change if you like